National Sisters Day is celebrated on the first Sunday of August. Nothing can quite compare to the bond that sisters have, and this is a day to treasure the closeness that forms as you grow up together, sharing your secrets, your dreams, and all the fun times. Sisters have a deep connection that grows throughout childhood and remains strong throughout life. National Sisters Day is a chance for you to spend some quality time with your sister and to cherish the connection that you have.

Resource: https://nationaltoday.com/sisters-day/